Which of the following statements are correct:
As a body falls, its kinetic and potential energies remain unchanged.
A plasticine falls to the ground and stops without bouncing. The potential energy before the fall is equal to the internal energy when it stops on the ground.
A parachutist falls evenly towards the ground. The potential energy of the parachute is converted into the internal energy of the parachute and the surrounding air during the fall.
An athlete throws a spear with the force of his body. After 50 m of flight, the spear sinks into the ground. The law of conservation of energy applies from the moment the athlete picks up the spear.
A pendulum oscillates from one extreme position to another. The total energy of the pendulum is equal to its kinetic energy at its lowest, i.e., equilibrium position.
A car accelerating up a hill applies the law of conservation of energy.
